fixed gear chainring Kappstein Chainring - Ruphus Standard | Fixed Gear Bike

fixed gear chainring Kappstein Chainring - Ruphus Standard | Fixed Gear BikeProduct Introduction The Kappstein Ruphus Standard Chainring is a precision engineered fixed gear and track chainring, developed for riders seeking a balance of lightweight construction, stiffness, and refined design. Manufactured in Germany from high strength 7075 T6 aluminum, the Ruphus Standard is CNC machined from a solid plate to achieve excellent rigidity at low weight. Designed for 1 2" 1 8" standard track chains, it provides reliable and

Product Introduction

The Kappstein Ruphus Standard Chainring is a precision-engineered fixed gear and track chainring, developed for riders seeking a balance of lightweight construction, stiffness, and refined design.

Manufactured in Germany from high-strength 7075-T6 aluminum, the Ruphus Standard is CNC-machined from a solid plate to achieve excellent rigidity at low weight. Designed for 1/2" × 1/8" standard track chains, it provides reliable and efficient drivetrain performance for fixed gear, singlespeed, and track applications.

Why This Chainring Is Different

• Optimized for standard track and fixed gear drivetrains (1/8" chain)
• Lightweight yet rigid CNC-machined construction
• Clean structural design with refined aesthetic integration
• Developed for reliable performance in real riding conditions

Technology Inside

This chainring incorporates key Kappstein drivetrain technologies:

• Round-Teeth Technology – improves chain engagement and reduces friction
• Precision CNC-machined geometry for stiffness and durability
• Optimized tooth profile for stable chain retention

Learn more:

• Round-Teeth Technology
• Our Technology

Real-World Performance

In fixed gear and singlespeed riding, drivetrain simplicity places greater importance on component precision and durability. The Ruphus Standard chainring is engineered to deliver:

• Smooth and consistent power transmission
• Reduced drivetrain friction and wear
• Reliable chain retention under varying load conditions
• High stiffness for efficient power transfer
• Increased efficiency is subtly felt by the rider through a precisely tuned drivetrain

These characteristics make it well suited for urban riding, fixed gear setups, and track use.

Applications

Ideal for:

• Fixed Gear Bikes
• Track Cycling
• Singlespeed Drivetrains
• Urban Riding

Technical Specifications

Material: 7075-T6 Aluminum
Bolt Circle Diameter (BCD): 5 × 144 mm
Tooth Range: 47T, 49T – 52T
Chain Compatibility: 1/2" × 1/8" standard track chains
Surface Treatment: Anodized
Weight: Approx. 111 g (49T)
Color: Black
Manufacturing: 100% CNC-Machined in Germany

• How to select Kappstein Chainrings and Sprockets

Recommended Setup

For optimal drivetrain performance, the Ruphus Standard chainring is designed to be used with:

• Kappstein Standard sprockets
• 1/2" × 1/8" track chains

About Kappstein

Kappstein is a German engineering company specializing in high-efficiency bicycle drivetrain components. Through precision machining and applied mechanical research, the company develops chainrings, hubs, and drivetrain systems designed for maximum efficiency, durability, and smooth engagement behaviour.

Learn more about Kappstein and the company’s engineering philosophy.

Manufacturer:

Kappstein GmbH & Co. KG 
Südstraße 15, Gebäude 14
99867 Gotha
Germany
[email protected]